Means for preventing the turning of cylinder and like locks



Jan. 15 1924;.

W. D. BACON MEANS FOR PREVENTING THE TURNING OF pymwnsn AND mks LOCKS Filed Jan. 6, 1922 Patented Jan, 15,1924.

sr'rss 'WILLIAllI DANIEL BACON, F VTELLING-TOIN, NEWZEALAND.

MEANS Foe rnEvnN'rrNG'Ti-In TURNING or CYLINDER AND LIKnLooKs.

Application filed January 6, 1922 Serial No. 527,494.

To all whom it may concern.

Be it known that I, lVILLiAM DANIEL BA- coN, a subject of the King of Great Britain and Ireland, residing in Kilbirnie, in the city 6 of l/Vellington, in the Dominion of New Zealand, have invented new and useful Improvements in Means for Preventing the Turning of Cylinder and like Locks; and I do hereby declare the following to'be a full, clear, and exact description of the same.

This invention relates to means for preventing the turning of cylinder locks of such types as the Yale night latches, and relates particularly to those means in which a separate element is provided to engage the wood-work of the door and containing a slot or shaped opening in which a portion of the lock engages.

My invention will now be described with the aid of the accompanying drawings, wherein Figure 1, is a perspective view of the dev1ce.

Figure 2, is an end view of the device, from the inside of a door.

Figure 3, is a sectional elevation of a door and of the device showing the body of the lock inserted therein.

Figure 4, is an end view of the device showing the lock inposition.

The device consists of an annular wall 1, cylindrical or approximately in shape, and having fins 2 projecting radially from the outer periphery of the wall in order to bite into the wood-work of the door. A portion of the annular wall 1 extends forwardly and forms prongs 3 and 4, the space between such prongs forming a slot 5.

\Vhen the usual round hole 6 is bored in the door 7 the device is inserted into the hole from the side of the door opposite to that in which the body of the lock 8 is to be inserted. The lock 8 is then inserted from the opposite side of the door the spring container 9 of the lock engaging in the slot 5 between the prongs 3 and 4 of the plug, the connecting latch bar 10 ot the lock being passed through the annular wall 1. The usual plate and screws are now inserted over the latch bar 10 and the remainder of the lock, indicated at 11, inserted upon the door in the usual manner. When the usual ring 14 is employed the prongs 3 and 4 may extend into such ring and if the door is thicker than the length of the plug, such plug be driven further into the door meats until the prongs project sufficiently to en I gage the spring container 9.

It wlll be seen that the ordinary circular hole thatis bored in the wood-work to re ceive the lockmay be used without using any tools to vary the shape of such hole, the

plug being simply driven in with an ordi nary hammer or mallet. It will also be seen that since the spring container 9 engages the slot 5 the lock cannot be turned without turning the annular wall which will not turn without either shearlng the fins or tearing the adjacent wood of the door. Itwill also be noticed that the lugs 12 of the lock will also hear against the edges 13 of the prongs should turning of the lock be attempted.

If desired, the annular wall and the prongs 3 and 4 may be made slightly tapered to facilitate the insertion'of the plug into the hole. edges thereof being made more or less sharp, and preferably finish slightly behind the front edge of the wall so that the. device The fins are also tapered, the

can be more easily and accurately entered into the hole.

What I claim is:

1. The combination with a. door having an I opening therein, a lock secured to said door, said lock comprising a latch bolt and spring container, of a keeper comprising a cylin- ,1

drical body portion adapted to be seated within said opening, prongs extending from one end of said cylindrical body portion and adapted to project on each side of said spring container and fins projecting radially from the outer periphery of said cylindrical body portion.

2. The combination with a door having a lock opening therein, a lock extending within one end of said opening, a latch bolt arranged at the opposite end of said opening and a latch bar connecting said lock and latchbolt, of a keeper adapted to prevent the rotation of said lock and extending within said door opening from the end thereof over which is arranged the latch bolt, said latch bar being adapted to extend through said keeper, a ring positioned between said door and lock and one end of said keeper adapted to project within said ring.

' 3. In a device of the character described, comprising a cylindrical sleeve having an outer tapered periphery, pair of spaced prongs formed with one end of said cylinder In testimony whereof, I have signed my In and providing a slot therebetween, the outer neme to th s specificatipn in the presence of fa ce of' sal d prongs; beingjteperedendcontwo subscribing Witnesses.

tigguous' With the Outer'periplier'y "of said 4 cylindrical sleeve, radially extendingtapered WILLIAM DANIEL BALON fins formed with the periphery of said sleeve \Vitnesse: and said fins being tapered in an opposite SYDNEY H. HIGGs, direction to 'the'ta' er 0f seidsleeve. NORA 'MUIR. 

